- do not segfault when we fail to parse a pkcs15 DF

git-svn-id: https://www.opensc-project.org/svnp/opensc/trunk@771 c6295689-39f2-0310-b995-f0e70906c6a9

src/libopensc/pkcs15.c

@@ -908,6 +908,9 @@ int sc_pkcs15_parse_df(struct sc_pkcs15_card *p15card,
 	else
 		r = sc_pkcs15_read_file(p15card, &df->path,
 					&buf, &bufsize, &df->file);
+	if (r < 0)
+		return r;
+
 	p = buf;
 	do {
 		const u8 *oldp;